CN114513216A - Radio frequency system and electronic equipment - Google Patents
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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- H—ELECTRICITY
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- H04B—TRANSMISSION
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- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
A radio frequency system and an electronic device are provided. The radio frequency system includes: the detection path comprises a first coupler, a second coupler and a filtering unit, the first coupler is coupled with a first signal transmitted by the first transmission path to output a first coupling signal, the second coupler is coupled with a second signal transmitted by the second transmission path to output a second coupling signal, the filtering unit is used for filtering the first coupling signal and outputting a first detection signal to the radio frequency transceiver, the second coupling signal is filtered and then outputting a second detection signal to the radio frequency transceiver, and the radio frequency signal controller is used for performing power control according to the first detection signal and the second detection signal. According to the scheme provided by the embodiment, the coupling signal is filtered by using the filtering unit, so that the detection isolation is improved, the effective signal ratio in the detection signal is improved, and the accuracy of power control is improved.
Description
Technical Field
The present disclosure relates to communication technologies, and more particularly, to a radio frequency system and an electronic device.
Background
Fifth generation (5)thGeneration, 5G) network architecture includes independent networking (SA) and dependent-independent Networking (NSA). An important feature of NSA is dual connectivity, i.e. the communication device can be simultaneously connected to the fourth generation (4)thGeneration, 4G) networks and 5G networks communicate, typically with one master and one slave connection. In the Phase 7LE rf solution, a Power Amplifier module (Power Amplifier Modules including Duplexers,PA-MID) implements the long term evolution new air interface Dual Connectivity (endec) Dual-transmission function. The PA-MID includes two Power Amplifiers (PA) capable of working simultaneously, generates two paths of signals and outputs them simultaneously through different antenna ports, and each path of signal has an independent Coupler (CPL) to perform Feedback signal reception (FBRX) detection, that is, collects the Feedback signal through the CPL, thereby detecting and controlling the transmitted signal. In the related art, when two paths of signals are simultaneously output through different antenna ports, the detection and control effects on the transmitted signals are poor, and improvement is needed.
Disclosure of Invention
The embodiment of the application provides radio frequency system electronic equipment, which reduces feedback signal receiving and detecting interference.
An embodiment of the present application provides a radio frequency system, including:
a radio frequency transceiver;
a first transmitting path, connected with the radio frequency transceiver, configured to perform transmitting processing on a first signal;
a second transmission path, connected with the radio frequency transceiver, configured to perform transmission processing on a second signal;
the detection path is connected with the radio frequency transceiver and comprises a first coupler, a second coupler and a filtering unit respectively connected with the first coupler and the second coupler, wherein the first coupler is coupled with the first transmission path to generate a first coupling signal, and the filtering unit is used for filtering a second signal in the first coupling signal to generate a first detection signal; the second coupler is coupled with the second transmitting path to generate a second coupled signal, and the filtering unit performs filtering processing on a first signal in the second coupled signal to generate a second detection signal;
the radio frequency transceiver controls the transmitting power of the first signal according to the first detection signal and controls the transmitting power of the second signal according to the second detection signal.
The embodiment of the present disclosure provides an electronic device, including the above radio frequency system.
Compared with the related art, the embodiment of the application comprises a radio frequency system and electronic equipment, wherein the radio frequency system comprises: the detection path comprises a first coupler, a second coupler and a filtering unit respectively connected with the first coupler and the second coupler, the first coupler is coupled with a first signal transmitted by the first transmission path to output a first coupling signal, the second coupler is coupled with a second signal transmitted by the second transmission path to output a second coupling signal, the filtering unit is used for filtering the first coupling signal and outputting a first detection signal to the radio frequency transceiver, the filtering unit is used for filtering the second coupling signal and outputting a second detection signal to the radio frequency transceiver, and the radio frequency signal processor is used for performing power control according to the first detection signal and the second detection signal. According to the scheme provided by the embodiment, the coupling signal is filtered by using the filtering unit, the interference signal in the coupling signal is removed, the receiving detection isolation of the feedback signal is improved, the effective signal ratio in the feedback signal receiving signal is improved, the accuracy of power control is improved, and the quality of the transmitting signal is further improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic diagram of a radio frequency system according to an embodiment;
fig. 2 is a schematic diagram of FBRX detection provided in an embodiment;
fig. 3 is a schematic diagram of a radio frequency system provided by an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a radio frequency system provided in an exemplary embodiment;
FIG. 5 is a schematic diagram of a detection path provided in an exemplary embodiment;
FIG. 6 is a schematic illustration of a detection path provided in another exemplary embodiment;
fig. 7 is a flowchart of a method for controlling a radio frequency system according to an exemplary embodiment;
FIG. 8 is a schematic diagram of a radio frequency system provided in an exemplary embodiment;
fig. 9 is a schematic diagram of a radio frequency system according to another exemplary embodiment.
Detailed Description
The description herein describes embodiments, but is intended to be exemplary, rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible that are within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented individually or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
The radio frequency system according to the embodiment of the present application may be applied to an electronic device with a wireless communication function, where the electronic device may be a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing devices connected to a wireless modem, and various forms of User Equipment (UE) (e.g., a mobile phone), a Mobile Station (MS), and so on.
Fig. 1 is a schematic diagram of a radio frequency system according to an embodiment. As shown in fig. 1, the radio frequency system may include: a radio frequency transceiver, a PA-MID (Power Amplifier Modules with Integrated Duplexer), a first coupler CPL1, a second coupler CPL2, and a single pole four throw (SP4T) switch. The PA-MID can support the transmission and the reception of two signals with different frequency bands. The PA-MID may include a MID Band PA (MB PA), a High frequency PA (High Band PA, HB PA), a Low Noise Amplifier (Low Noise Amplifier, LNA), an if Switch MB SW, a High frequency Switch HB SW, and a plurality of Band pass filters (including but not limited to B1, B3, B7, B40, B41 in fig. 1, which are respectively used for filtering a B1 signal, a B3 signal, a B7 signal, a B40 signal, and a B41 signal, and the corresponding filter combinations may be selected according to the endec combinations), and Antenna switches (Antenna Switch, ASW), a double-pole 5-throw (DP5T) Switch, etc. The first coupler CPL1 may be integrated within the PA-MID, with the resulting FBRX signal being coupled out through port CPL.
The PA-MID respectively receives a first radio frequency signal sent by the radio frequency transceiver through the first radio frequency transmitting port MB RFIN, receives a second radio frequency signal sent by the radio frequency transceiver through the second radio frequency transmitting port HB RFIN, amplifies the received radio frequency signal through the LNA, and transmits the amplified radio frequency signal to the radio frequency transceiver through the radio frequency receiving port PRXOUT.
The MB PA amplifies the received first rf signal, filters it through a filter selected by the MB SW, and then selects an antenna for transmission through the ASW and DP 5T. The transmission of the second radio frequency signal is similar and will not be described in detail.
Both PAs may operate simultaneously. Taking B3-N41 endec as an example, two paths of signals output by two PAs are output by different pins (for example, the signals are output by an ANT1 pin and an endec N41 pin in fig. 1, and an ANT2 pin in fig. 1 is not used for the moment), and each path of signal has an independent CPL (a first coupler CPL1 and a second coupler CPL2, respectively) to perform FBRX detection, the FBRX signal coupled by the first coupler CPL1 is output to the radio frequency transceiver through SP4T to realize power control on the first radio frequency signal, and the FBRX signal coupled by the second coupler CPL2 is output to the radio frequency transceiver through SP4T to realize power control on the second radio frequency signal.
Fig. 2 is a schematic diagram of FBRX detection provided in the embodiment. As shown in fig. 2, FBRX detection includes:
the waveform generator generates a transmit signal which in turn passes through a transmit signal digital power amplifier (G)DIGtx) And the transmission signal is amplified by the analog power amplifier (Gtx) and then transmitted by the antenna.
The FBRX signal is obtained by coupling (sample reception) the transmit signal through one CPL.
The FBRX signal goes through the feedback signal analog power amplifier (G)FBRX) And a feedback signal digital power amplifier (G)DIG) Enter Inner Loop Power Control (ILPC);
the ILPC detects the magnitude and quality of the FBRX signal, generates a power control signal, and feeds the power control signal back to the transmit signal digital power amplifier (G)DIGtx) To accomplish power control of the transmitted signal.
The waveform generator and the transmission signal digital power amplifier (G)DIGtx) Feedback signal analog power amplifier (G)FBRX) Feedback signal digital power amplifier (G)DIG) And the inner loop power control may be located at the radio frequency transceiver, the transmit signal analog power amplifier (Gtx) may be the aforementioned MB PA or HB PA.
During FBRX detection, FBRX calibration is performed first. During calibration, the transmitting signal P is fixed by the RF transceiverReferenceAnd detecting the output power TX of the transmitted signal by an external instrumentmeasure. The transmitting signal is sampled by a CPL with a fixed coupling coefficient to obtain FBRXCPL。FBRXCPLBy G of known gainFBRXAnd GDIGEnter ILPC to obtain FBRXILPC. By FBRX calibration, P can be obtainedReferenceAnd TXmeasure、FBRXCPL、FBRXILPCAnd finally finishing the power control by the one-to-one correspondence relationship.
The CPL is a general radio frequency component and can be used for signal isolation, separation and mixing, such as power monitoring, source output power amplitude stabilization, signal source isolation, transmission and reflection sweep frequency testing and the like. The main technical indexes include directivity, standing-wave ratio, coupling degree and insertion loss. However, CPL does not have frequency selectivity, and the main difference is that the coupling coefficient is different for different frequency signals. CPL with different coupling coefficients can be obtained by adjusting the design of the coupler.
In the present disclosure, Phase 7LE radio architecture endec B3-N41 combination is illustrated, but the disclosed embodiments are applicable to and not limited to any dual or multiple issue combination of any radio architecture.
In the Phase 7LE architecture endec dual transmission, as shown in fig. 1, both endec B3 signal and endec N41 signal are present in the radio link. During signal transmission, FBRX detection is performed. The platform will take turns detecting the endec B3 signal and the endec N41 signal at different slots of different frames (only one signal at a time, for example, 20 microseconds (us)).
When the FBRX detection is performed on the ENDC B3 signal, the ENDC N41 signal is still present, and if the path isolation of the ENDC B3FBRX path from the ENDC N41 signal is not enough, the ENDC N41 signal leaks to the ENDC B3FBRX path, so that the FBRX signal of the ENDC B3 signal is interfered. Likewise, the ENDC B3 signal may leak into the ENDC N41 FBRX path, causing the FBRX signal of the ENDC N41 signal to be disturbed.
The example is given for the common power combination 0+26 (i.e. the power of the ENDC B3 signal is 0dBm, the power of the ENDC N41 signal is 26dBm), and the path isolation between the ENDC B3FBRX path and the ENDC N41 path is 40 dB. The coupling coefficients of CPL1 and CPL2 are-20 dB to-30 dB, the coupling coefficients of CPL1 and CPL2 are-25 dB, and for the ENDC B3 signal, the FBRX signal FBRX obtained by CPL1 samplingCPL1The power was-25 dBm.
The ENDC B3FBRX path has 40dB of isolation from the ENDC N41 path, and an interference signal FBRX caused by the ENDC N41 signal leaked to the ENDC B3FBRX pathInterferenceThe power of (a) is-14 dBm;
interference signal FBRXInterferenceHas a power (-14dBm) much greater than that of FBRX signal FBRXCPL1(-25dBm), the interfering signal is much larger than the desired signal, causing interference to the desired signal, which affects the operation of the FBRX receiver.
In addition, when FBRX calibration is performed on ENDC B3-N41, B3 and N41 links are independently calibrated respectively, namely, when FBRX calibration is performed on a B3 path, N41 does not work, so that leakage does not generate interference on FBRX during FBRX calibration. That is to say, there is a difference between FBRX calibration and actual FBRX detection, and the FBRX calibration cannot solve the problem of insufficient isolation during FBRX detection, so that it is difficult for FBRX detection to achieve good control over power.
FBRX suffers from interference with the following adverse effects:
the interference signal may cause the ILPC to receive more power than normal FBRXILPCPower, when power control is performed, results in a small output powerAt the expected value.
The presence of the interference signal may degrade the quality of the received signal demodulated by the ILPC, which may affect the quality of the output signal. For example, in Digital Pre-Distortion (DPD), the transmitted signal is Pre-distorted in advance by the FBRX signal, and when the FBRX signal itself is distorted, the transmitted signal obtained by adjusting the FBRX signal is also distorted, and during detection, the Adjacent Channel Leakage Power Ratio (ACLR) and Error Vector Magnitude (EVM) indicators are deteriorated.
If FBRXInterferenceToo large, it may cause ILPC blocking, and if it exceeds its upper limit of reception capability, it may affect normal ILPC use.
In the embodiment of the present disclosure, a radio frequency system is provided, where when a transmission signal is detected, a filtering unit is used to filter out a corresponding interference signal in an FBRX signal, so as to improve an effective signal ratio in the detection signal, improve accuracy of power control, and further improve quality of the transmission signal.
Fig. 3 is a schematic diagram of a radio frequency system according to an embodiment of the disclosure. As shown in fig. 3, an embodiment of the present disclosure provides a radio frequency system, including:
a radio frequency transceiver;
a first transmitting path, connected with the radio frequency transceiver, configured to perform transmitting processing on a first signal;
a second transmission path, connected with the radio frequency transceiver, configured to perform transmission processing on a second signal;
a detection path connected to the rf transceiver, wherein the detection path includes a first coupler, a second coupler, and a filtering unit connected to the first coupler and the second coupler, respectively, where the first coupler is coupled to the first transmission path to generate a first coupled signal, and the filtering unit filters a second signal of the first coupled signal to generate a first detection signal; the second coupler is coupled with the second transmitting path to generate a second coupled signal, and the filtering unit performs filtering processing on a first signal in the second coupled signal to generate a second detection signal;
the radio frequency transceiver is configured to control a transmit power of the first signal based on the first detection signal and to control a transmit power of the second signal based on the second detection signal.
When a first signal and a second signal exist simultaneously, the second signal may exist in a first coupling signal generated by coupling the first coupler with the first transmission path, and the first coupling signal is a coupling signal of the first signal in a first detection signal obtained by filtering the second signal in the first coupling signal by using a filtering unit, so that the signal quality is improved, the power of the first signal can be more accurately reflected by the first detection signal, and the power control based on the first detection signal is more accurate. In addition, compared with the scheme that the first coupling signal is directly output to the radio frequency transceiver without filtering, the scheme provided by the embodiment can reduce the power of the first detection signal output to the radio frequency transceiver from the detection path after the second signal in the first coupling signal is removed, thereby avoiding causing the inner loop power control blockage in the radio frequency transceiver and improving the system performance. The filtering process of the second coupled signal is similar and will not be described again.
According to the scheme provided by the embodiment, the coupling signal is filtered by using the filtering unit, the interference signal in the coupling signal is removed, the detection isolation of the FBRX is improved, the effective signal proportion in the detection signal is improved, the accuracy of power control is improved, and the quality of the transmission signal is further improved.
In an exemplary embodiment, the processing of the first signal by the first transmission path may include: and the first transmission path is used for transmitting the first signal after amplifying and filtering the first signal.
In an exemplary embodiment, the performing, by the second transmission path, transmission processing on the second signal may include: and the first transmission path is used for transmitting the second signal after amplifying and filtering the second signal.
As shown in fig. 4, in an exemplary embodiment, the first transmission path and the second transmission path may be implemented using a radio frequency power amplification module. The radio frequency power amplification module may include a plurality of power amplifiers, a plurality of switches, a plurality of filters, an antenna switch, and the like. . The power amplifier, the switch, the filter and the antenna switch form a transmitting path to realize the transmitting processing of the signal from the radio frequency transceiver. The transmission processing includes: and amplifying and filtering the signals and then transmitting the signals. The radio frequency system may further include an antenna module, which may include a plurality of antenna elements, such as a first antenna element and a second antenna element. The antenna switch is used for conducting the transmission path and the antenna unit according to requirements, for example, conducting the first transmission path and the first antenna unit, and conducting the second transmission path and the second antenna unit. The disclosed embodiments are not so limited and the rf system may include more transmit paths.
In an exemplary embodiment, the radio frequency system may further include a plurality of receiving paths for receiving radio frequency signals and transmitting the radio frequency signals to the radio frequency transceiver, so as to receive the signals.
In an exemplary embodiment, the coupler of the detection path may be provided independently or integrated with the rf power amplifying module.
Fig. 5 is a schematic diagram of a radio frequency system according to an exemplary embodiment. In this embodiment, the filtering unit is an adjustable filter. As shown in fig. 5, the radio frequency system provided in this embodiment may include a radio frequency transceiver, a first transmission path, a second transmission path, and a detection path, where the detection path includes a first coupler, a second coupler, and a filtering unit (in this embodiment, a tunable filter), and the tunable filter is configured to adjust a filtering parameter according to the first coupled signal or the second coupled signal to perform filtering processing on the first signal or the second signal. That is, the tunable filter receives the first coupled signal, adjusts the filtering parameter to be the first filtering parameter to perform filtering processing on the second signal in the first coupled signal, and the tunable filter receives the second coupled signal, and adjusts the filtering parameter to be the second filtering parameter to perform filtering processing on the first signal in the second coupled signal. For example, the tunable filter may be configured as a low-pass filter, a band-pass filter, a high-pass filter, or the like according to the frequency bands of the first signal and the second signal. The tunable filter may be tuned by radio frequency software configuration.
According to the scheme provided by the embodiment, the adjustable filter is dynamically adjusted to filter the first coupling signal and the second coupling signal when different frequency band signals are detected by using the adjustable filter, so that the effect of improving the isolation degree of the FBRX is achieved, a plurality of independent filters are not required to be arranged, the implementation is simple and convenient, and the cost is low.
In an exemplary embodiment, the first signal may be a first frequency band signal in an endec scenario, and the second signal may be a second frequency band signal in the endec scenario. The frequency band of the first frequency band signal may be different from the frequency band of the second frequency band signal. The frequency band of the dual-transmission signal in the scenario of the endec is not limited in this embodiment, and may be a combination of any frequency bands, for example, a P + Q format, where the P frequency band includes any one of B1, B3, B39, B41, B77, B78, N1, N3, N39, N41, N77, and N78, and the Q frequency band includes any one of the following frequency bands different from the P frequency band: b1, B3, B39, B41, B77, B78, N1, N3, N39, N41, N77, N78. For example, the first signal may be an endec B1/B3/B39 signal, and the second signal may be an endec N41/N77/N78 signal, but the embodiment of the disclosure is not limited thereto and may be another signal.
In an exemplary embodiment, the filtering unit is configured to be a low-pass or band-pass filter when filtering the first coupling signal, and the pass band includes a frequency band in which the first frequency band signal is located, and the stop band includes a frequency band in which the second frequency band signal is located. In this embodiment, the frequency band of the first frequency band signal may be smaller than the frequency band of the second frequency band signal, and when the filtering unit is configured as a low-pass filter or a band-pass filter, since the stop band includes the frequency band of the second frequency band signal, the second signal (in this case, the second frequency band signal) in the first coupling signal may be filtered.
In an exemplary embodiment, when the filtering unit filters the second coupling signal, a band-pass filter or a high-pass filter is set, and the stop band includes a frequency band in which the first frequency band signal is located, and the pass band includes a frequency band in which the second frequency band signal is located. In this embodiment, the frequency band of the first frequency band signal may be smaller than the frequency band of the second frequency band signal, and when the filtering unit is configured as a band pass filter or a high pass filter, since the stop band includes the frequency band of the first frequency band signal, the first signal (in this case, the first frequency band signal) in the second coupling signal may be filtered.
Taking the first signal as an endec B3 signal (the frequency band is 1710MHz to 1785MHz), the second signal is an endec N41 signal (the frequency band is 2496MHz to 2690MHz), the tunable filter can be set as a low-pass or band-pass filter when filtering the first coupling signal, the pass band includes the frequency band where the endec B3 signal is located, the pass band is 0 to 2000MHz for example, the stop band includes the frequency band where the second signal is located, and the stop band is 2000MHz to 3000MHz for example, but the embodiment of the disclosure is not limited thereto, the pass band and the stop band can be other values, and it is sufficient to filter signals outside the frequency band where the endec B3 signal is located; the tunable filter may be configured as a high-pass or band-pass filter when filtering the second coupling signal, and the stop band includes a frequency band in which the endec B3 signal is located, the stop band is, for example, 0 to 2000MHz, the pass band includes a frequency band in which the endec N41 signal is located, and the pass band is, for example, 2000MHz to 3000 MHz. However, the embodiment of the present disclosure is not limited thereto, and the pass band and the stop band may be other values, and it is sufficient to filter signals outside the frequency band where the endec N41 signal is located.
In an exemplary embodiment, there are scenarios where a single signal is transmitted, such as an SA scenario, where the signal to which the coupler is coupled does not need to be filtered, and therefore, the tunable filter may be set to the pass-through state. The SA signal of the SA scenario may be transmitted using either the first transmission path or the second transmission path. The SA signal may be transmitted through the second transmission path, but the embodiments of the present disclosure are not limited thereto. When the SA signal is transmitted through the first transmission path, the first signal may be an independent networking signal of an SA scene; the filtering unit is further configured to set to a pass-through state when the first signal is an independent networking signal of the SA scene.
In this embodiment, the SA signal and the first frequency band signal are both coupled by using the first coupler, and since there is no interference signal transmitted simultaneously when the SA signal is transmitted, there is no need to filter the coupled signal of the SA signal, at this time, the adjustable filter may be set to a bypass state or a pass-through state, and the adjustable filter does not filter the input coupled signal, and directly outputs the coupled signal.
In an exemplary embodiment, as shown in fig. 5, the detection path may further include: a switch unit that may include a plurality of first terminals (only first terminals P1 and P2 are shown in fig. 5, but the disclosed embodiments are not limited thereto and may include more input terminals) and one second terminal T; the first coupler is connected to one of the first terminals P1, the second coupler is connected to the other first terminal P2, and the second terminal T is connected to the filtering unit;
the switching unit is configured to selectively turn on a path between the filtering unit and the first coupler or the second coupler. In this embodiment, the filtering of signals of different transmission paths is realized by setting the switch unit. However, the embodiment of the present disclosure is not limited to this, and the signals of the first coupler and the second coupler may be both output to the filtering unit without providing the switching unit, and the filtering unit selects to filter the output signal of the first coupler or the output signal of the second coupler in a software manner.
In this embodiment, only two first terminals of the switching unit are shown, in other embodiments, the switching unit may include a plurality of first terminals to transmit signals of more transmission paths to the filtering unit.
In an exemplary embodiment, the switch unit is, for example, a single-pole multi-throw switch, such as a single-pole four-throw switch, but the embodiments of the present disclosure are not limited thereto, and may be other devices that can implement a function of a multi-way switch.
Fig. 6 is a schematic diagram of a radio frequency system according to another exemplary embodiment. In this embodiment, the filtering unit may include two filtering devices: the first filter and the second filter, that is, in this embodiment, separate filters are provided for the coupled signals coupled to each coupler for filtering. As shown in fig. 6, the radio frequency system provided in this embodiment may include: the device comprises a radio frequency transceiver, a first transmission path, a second transmission path and a detection path, wherein the detection path comprises a first coupler, a second coupler and a filtering unit. The filtering unit comprises a first filter and a second filter, the first filter is connected to the first coupler, and the first filter carries out filtering processing on a second signal in the first coupled signal to generate the first detection signal; the second filter is connected to the second coupler, and the second filter performs filtering processing on a first signal in the second coupled signal to generate the second detection signal.
According to the scheme provided by the embodiment, the two filters are independently arranged to respectively filter the output signals of the first coupler and the second coupler, the filtering unit does not need to be dynamically arranged, and the use is more convenient. Wherein the filtering may be performed using respective types of filters according to the frequency band of the first signal and the frequency band of the second signal, for example, the first filter and the second filter may be band-stop filters or band-pass filters.
In an exemplary embodiment, the first filter may be a band-stop filter. For example, when the first signal is a first frequency band signal in an endec scenario, and the second signal is a second frequency band signal in the endec scenario, the stop band of the band-elimination filter may include a frequency band where the second frequency band signal is located, and the first filter may filter the second frequency band signal in the first coupling signal.
In an exemplary embodiment, the second filter may be a band pass filter. For example, when the first signal is a first frequency band signal in an endec scene, and the second signal is a second frequency band signal in the endec scene, the pass band of the band-pass filter may include a frequency band where the second frequency band signal is located, and the second filter only passes the second frequency band signal in the second coupling signal, so as to filter the first frequency band signal in the second coupling signal.
In addition to the endec scenario, there is a scenario in which a signal is transmitted separately in the system, for example, an SA scenario, and at this time, if all frequency bands of the SA signal are transmitted in the first transmission path, there may be a situation in which a coupled signal of the SA signal of a partial frequency band is filtered by the first filter or the second filter, so that the detected signal cannot correctly reflect the transmitted SA signal, and the power control is not accurate enough, and therefore, the SA signal of the SA scenario may be divided into two signals: the first independent networking signal and the second independent networking signal are transmitted through the first transmitting path and the second transmitting path respectively, the frequency band of the first independent networking signal avoids the signal frequency band to be filtered of the first filter, and the second independent networking signal avoids the signal frequency band to be filtered of the second filter. In an exemplary embodiment, the first signal may be a first independent networking signal in an SA scenario, and the second signal may be a second independent networking signal in the SA scenario; the frequency band of the first independent networking signal does not include the frequency band of the second frequency band signal, and the frequency band of the second independent networking signal includes the frequency band of the second frequency band signal or a subset of the frequency band of the second frequency band signal.
In the scheme provided by this embodiment, the SA signal is divided into two signals, one of which includes the frequency band of the second frequency band signal and transmits through the transmission path (the second transmission path) of the second frequency band signal, and the other of which does not include the frequency band of the second frequency band signal and transmits through the transmission path (the first transmission path) of the first frequency band signal, so that the first filter and the second filter are prevented from affecting the SA signal.
In an exemplary embodiment, the first signal may be an ENDC B3 signal and the second signal may be an ENDC N41 signal. The first SA signal is, for example, a signal not including the N41 band, and the second SA signal is a signal including the N41 band or a signal including a subset of the N41 band. The first SA signal and the endec B3 signal are transmitted through the same transmit path, and the second SA signal, such as SA N41, SA N38, etc., and the endec 41 signal are transmitted through the same transmit path.
In another exemplary embodiment, the SA signal may be divided into a signal including a frequency band in which the first frequency band signal is located and transmitted through a transmission path in which the first frequency band signal is located, and a signal not including the frequency band in which the first frequency band signal is located and transmitted through a transmission path in which the second frequency band signal is located. For example, the first band signal may be an endec B3 signal, the second band signal may be an endec N41 signal, the SA signal may be divided into a third SA signal including the band in which B3 is located and a fourth SA signal not including the band in which B3 is located, the third SA signal may be transmitted through the first transmission path (i.e., transmitted through the same transmission path as endec B3), the fourth SA signal may be transmitted through the second transmission path (i.e., transmitted through the same transmission path as endec N4), the first filter may be configured to allow the B3 signal to pass, the second filter may be configured to block the B3 signal from passing, the third SA signal may not be affected by the first filter (the first filter may be a band pass filter including the band in which B3 is located), the fourth SA signal may not be affected by the second filter (the second filter may be a band stop filter including the band in which B3 is located, the fourth SA signal may not include the B3 band signal, and therefore not affected).
In an exemplary embodiment, as shown in fig. 6, the detection path may further include: a switch unit including a plurality of first terminals (only the first terminal P1 and the first terminal P2 are shown in fig. 6, but the disclosed embodiment is not limited thereto and may include more first terminals) and one second terminal T; the first filter is connected to one first terminal P1 of the switch unit, and the second filter is connected to the other first terminal P2 of the switch unit, wherein:
the switch unit is configured to selectively turn on a path between the first coupler, the first filter, and the radio frequency transceiver, or a path between the second coupler, the second filter, and the radio frequency transceiver. In this embodiment, different detection signals are input to the rf transceiver by setting the switch unit. However, the embodiment of the present disclosure is not limited to this, and the switch unit may not be provided, and both the output signal of the first filter and the output signal of the second filter may be output to the radio frequency transceiver, and the radio frequency transceiver selects the output signal of the first filter or the output signal of the second filter in a software manner and then performs subsequent processing.
Fig. 7 is a flowchart of a method for controlling a radio frequency system according to an embodiment of the present disclosure. As shown in fig. 7, the method for controlling a radio frequency system provided in this embodiment includes:
The method for controlling the radio frequency system according to the embodiment can improve the FBRX detection isolation, improve the effective signal ratio in the FBRX signal, and achieve more accurate power control by filtering the coupling signal.
In an exemplary embodiment, the filtering the second signal of the first coupled signal to generate the first detection signal includes: filtering a second signal in the first coupling signal by using an adjustable filter to generate a first detection signal;
the filtering the first signal of the second coupled signals to generate a second detection signal comprises: filtering a first signal in the second coupled signal using the tunable filter to generate a second detected signal;
the method further comprises the following steps: when the first signal is a first frequency band signal in an ENDC scene, the second signal is a second frequency band signal in the ENDC scene, and the first coupling signal is filtered, the filtering unit is set to be a low-pass or band-pass filter, a pass band comprises a frequency band of the first frequency band signal, and a stop band comprises a frequency band of the second frequency band signal; when the second coupling signal is filtered, the filtering unit is set to be a band-pass filter or a high-pass filter, the stop band comprises the frequency band where the first frequency band signal is located, and the pass band comprises the frequency band where the second frequency band signal is located.
According to the scheme provided by the embodiment, the tunable filter is used for filtering, the tunable filter is dynamically adjusted to filter interference signals in the first coupling signal and the second coupling signal, the FBRX detection isolation is improved, and the detection accuracy is improved.
In an exemplary embodiment, the method further comprises setting the tunable filter to a pass-through state when the first signal is an independent networking signal in an SA scenario.
In this embodiment, the tunable filter may not filter (pass through or bypass) the SA signal when the SA signal is received, so as to avoid affecting the FBRX detection of the SA signal.
In an exemplary embodiment, the filtering the second signal of the first coupled signal to generate the first detection signal includes: filtering a second signal in the first coupling signal by using a first filter to generate a first detection signal;
the filtering the first signal of the second coupled signals to generate a second detection signal comprises: filtering a first signal in the second coupling signals by using a second filter to generate a second detection signal;
the transmitting the first signal through the first transmission path comprises: transmitting a first frequency band signal under an ENDC scene through a first transmitting path, or transmitting a first independent networking signal under an SA scene through the first transmitting path;
the transmitting the second signal through the second transmission path includes: transmitting a second frequency band signal under an ENDC scene through a first transmitting path, or transmitting a second independent networking signal under an SA scene through a second transmitting path;
the frequency band of the first independent networking signal does not include the frequency band of the second frequency band signal, and the frequency band of the second independent networking signal includes the frequency band of the second frequency band signal or the frequency band subset of the second frequency band signal.
In this embodiment, when SA signals are transmitted, the SA signals are divided into two signals, where the first SA signal does not include the frequency band of the second frequency band signal, the second SA signal includes the frequency band of the second frequency band signal or the frequency band subset of the second frequency band signal, the first SA signal and the second SA signal are transmitted in different transmission paths, and different couplers are used for coupling, so that the first filter and the second filter are prevented from affecting the SA signals.
The technical solution of the embodiment of the present disclosure is further described below by taking the example of ENDC B3+ N41.
Fig. 8 is a schematic diagram of a radio frequency system according to an exemplary embodiment. As shown in fig. 8, the radio frequency system provided by the present embodiment may include a radio frequency transceiver, a power amplifier module PA-MID, a first coupler CPL1 and a second coupler CPL2, SP4T, and a tunable filter. The first coupler CPL1 may be integrated with the PA-MID. The first coupler CPL1 performs FBRX detection on the endec B3 signal and the SA signal, and the second coupler CPL2 performs detection on the endec N41 signal. When the SA signal works, only one signal path exists on the radio frequency link, and FBRX interference can not be generated.
When receiving the coupling signal of the endec B3 signal, the adjustable filter is adjusted to filter out a signal outside the frequency band of the endec B3, where the filtering out of the frequency band of the endec B3 is to filter out an interference signal outside the frequency band of the endec B3 (in this embodiment, the signal of the endec N41 may be filtered out), and in other embodiments, if there are other interference signals, the filtering out may be performed correspondingly. When a coupling signal of the ENDC B3 signal is received, the adjustable filter can be set to be a low-pass or band-pass filter, 0-2000 MHz is a pass band, 2000-3000 MHz is a stop band, and the purpose of restraining an ENDC N41 signal (the frequency band is 2496-2690 MHz) is achieved.
When receiving the coupling signal of the endec N41 signal, the adjustable filter is adjusted to filter out a signal outside the frequency band of endec N41, where the filtering out of the frequency band of endec N41 is to filter out an interference signal outside the frequency band of endec N41 (in this embodiment, the filtering out of the endec B3 signal may be used), and in other embodiments, if there are other interference signals, the filtering out may be performed accordingly. When a coupling signal of an ENDC N41 signal is received, the adjustable filter can be set to be a high-pass or band-pass filter, 0-2000 MHz is a stop band, 2000-3000 MHz is a pass band, and the purpose of restraining ENDC B3 signals (the frequency band is 1710-1785 MHz) is achieved.
The tunable filter is tuned to a bypass state or a pass-through state when receiving the coupled signal of the SA signal.
The first coupler CPL1 couples the endec B3 signal to generate an endec B3FBRX signal, the endec B3FBRX signal is output to SP4T, SP4T outputs the endec B3FBRX signal to the tunable filter, the tunable filter filters the endec B3FBRX signal to generate an endec B3FBRX filtered signal, and the endec B3FBRX filtered signal is output to the radio frequency transceiver, and the radio frequency transceiver performs power control on the endec B3 signal based on the endec B3FBRX filtered signal.
The second coupler CPL2 couples the endec N41 signal to generate an endec N41 FBRX signal, outputs the endec N41 FBRX signal to the SP4T, outputs the endec N41 FBRX signal to the adjustable filter, filters the endec N41 FBRX signal by the adjustable filter to generate an endec N41 FBRX filtered signal, and outputs the endec N41 FBRX filtered signal to the radio frequency transceiver, and the radio frequency transceiver performs power control on the endec N41 signal based on the endec N41 FBRX filtered signal.
The first coupler CPL1 couples the SA signal to generate an SA FBRX signal, which is output to SP4T, SP4T outputs the SA FBRX signal to the tunable filter, which directly outputs the SA FBRX signal to the radio frequency transceiver, which performs power control on the SA signal based on the SA FBRX signal.
In the solution provided in this embodiment, the improvement effect of the FBRX isolation is closely related to the rejection of the tunable filter on the stop band, for example, when the tunable filter operates in the endec B3FBRX, the rejection of the stop band (endec N41 band) is 40dB, and the isolation is correspondingly increased by 40dB, so that the solution provided in this embodiment can effectively improve the effect of the FBRX isolation.
Fig. 9 is a schematic diagram of a radio frequency system according to another exemplary embodiment. As shown in fig. 9, the radio frequency system provided in this embodiment may include: a radio frequency transceiver, a PA-MID, a first coupler CPL1 and a second coupler CPL2, an N41 band-stop filter N41 BSF (i.e., a first filter), an N41 band-pass filter N41 BPF, and an SP4T (i.e., a second filter). The first coupler CPL1 may be integrated with the PA-MID.
In this embodiment, compared to the previous embodiment, the rf path of the SA N41 signal may be changed, so that the SA N41 signal and the endec N41 signal are transmitted through the same rf path, and the rf path of the SA N41 signal may be changed through the rf software configuration; the other signals (referred to as the first SA signal) of the SA signal except the SA N41 frequency band are transmitted through the same radio frequency path as the endec B3 signal.
The N41 BSF filters signals of the N41 frequency band, for example, the stop band of the N41 BSF may be set to 2000MHz to 3000MHz, so as to suppress the endec N41 interference signal. The N41 BPF can pass signals of the N41 frequency band and filter signals outside the N41 frequency band, for example, the passband of the N41 BPF can be 2000MHz to 3000MHz, so that the noise signal of the endec B3 can be suppressed. The first SA signal has no signal of N41 band, so N41 BSF does not affect the first SA signal, and N41 BPF can pass the signal of N41 band, so the signal of SA N41 is not affected.
The first coupler CPL1 performs FBRX detection on the endec B3 signal and the first SA signal, and the second coupler CPL2 performs FBRX detection on the endec N41 signal and the SA N41 signal (i.e., the second SA signal).
In this embodiment, the SA N41 signal includes signals of the N41 frequency band and its sub-band in the SA signal, for example, the SA N38 signal, i.e., the SA N38 and the SA N41 signals are transmitted through the same transmission path. The SA N41 (the frequency band of B41 is the same as that of N41) is 2496MHz to 2690MHz, the N38 (the frequency band of B38 is the same as that of B3870 MHz to 2620MHz, and N38 is a sub-band of N41.
In an endec scenario, the first coupler CPL1 couples an endec B3 signal to generate an endec B3FBRX signal, the endec B3FBRX signal is output to N41 BSF, the N41 BSF filters a signal in an N41 frequency band from the endec B3FBRX signal, outputs an endec B3FBRX filtered signal to SP4T, the SP4T outputs the endec B3FBRX signal to a radio frequency transceiver, and the radio frequency transceiver performs power control on the endec B3 signal based on the endec B3FBRX filtered signal.
In an endec scenario, the second coupler CPL2 couples an endec N41 signal to generate an endec N41 FBRX signal, outputs the endec N41 FBRX signal to an N41 BPF, and the N41 BPF suppresses a signal in a B3 frequency band in the endec N41 FBRX signal, outputs an endec N41 FBRX filtering signal to an SP4T, and the SP4T outputs the endec N41 FBRX signal to a radio frequency transceiver, which performs power control on the endec N41 signal based on the endec N41 FBRX filtering signal.
In the SA scenario, the first coupler CPL1 couples the first SA signal to generate a first SA FBRX signal, the first SA FBRX signal is output to N41 BSF, N41 BSF filters the signal, the filtered first SA FBRX filtered signal is output to the radio frequency transceiver, and the radio frequency transceiver performs power control on the first SA signal according to the first SA FBRX filtered signal. The second coupler CPL2 couples the SA N41 signal to generate an SA N41 FBRX signal, the SA N41 FBRX signal is output to an N41 BPF, the N41 BPF filters the SA N41 FBRX filtered signal to obtain an SA N41 FBRX filtered signal, the SA N41 FBRX filtered signal is output to the radio frequency transceiver, and the radio frequency transceiver performs power control on the SA N41 signal according to the SA N41 FBRX filtered signal.
The rf systems shown in fig. 8 and 9 are only examples, and the embodiments of the present disclosure are not limited thereto, and may be other systems supporting dual or multiple transmissions.
The embodiment of the present disclosure provides an electronic device, which includes the radio frequency system according to any one of the above embodiments, and by setting the radio frequency system on the electronic device, an interference signal in FBRX detection can be suppressed, isolation of FBRX detection is improved, an effective signal ratio in the FBRX signal is improved, accuracy of power control is improved, and further, transmission signal quality is improved.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (12)
1. A radio frequency system, comprising:
a radio frequency transceiver;
a first transmitting path, connected with the radio frequency transceiver, configured to perform transmitting processing on a first signal;
a second transmission path, connected with the radio frequency transceiver, configured to perform transmission processing on a second signal;
the detection path is connected with the radio frequency transceiver and comprises a first coupler, a second coupler and a filtering unit respectively connected with the first coupler and the second coupler, wherein the first coupler is coupled with the first transmission path to generate a first coupling signal, and the filtering unit is used for filtering a second signal in the first coupling signal to generate a first detection signal; the second coupler is coupled with the second transmitting path to generate a second coupled signal, and the filtering unit performs filtering processing on a first signal in the second coupled signal to generate a second detection signal;
the radio frequency transceiver is configured to control a transmit power of the first signal based on the first detection signal and to control a transmit power of the second signal based on the second detection signal.
2. The radio frequency system according to claim 1, wherein the filtering unit is a tunable filter configured to adjust a filtering parameter according to the first coupled signal or the second coupled signal to perform filtering processing on the first signal or the second signal.
3. The radio frequency system of claim 2, wherein the first signal is an independent networking signal of an SA scenario;
the filtering unit is further configured to set to a pass-through state when the first signal is an independent networking signal of the SA scene.
4. The radio frequency system according to claim 1, wherein the first signal is a first frequency band signal in an ENDC scenario, and the second signal is a second frequency band signal in the ENDC scenario; when filtering the first coupling signal, the filtering unit is configured as a low-pass or band-pass filter, the pass band includes a frequency band where the first frequency band signal is located, and the stop band includes a frequency band where the second frequency band signal is located.
5. The RF system of claim 4, wherein the filtering unit is configured as a band-pass or high-pass filter when filtering the second coupled signal, and the stop band comprises a band in which the first band signal is located, and the pass band comprises a band in which the second band signal is located.
6. The radio frequency system according to any of claims 2 to 5, wherein the detection path further comprises: two first ends of the switch unit are respectively connected with the first coupler and the second coupler in a one-to-one correspondence manner, and one second end of the switch unit is connected with the filtering unit; the switching unit is configured to selectively turn on a path between the filtering unit and the first coupler or the second coupler.
7. The radio frequency system according to claim 1, wherein the filtering unit comprises:
a first filter connected to the first coupler, the first filter performing filtering processing on a second signal in the first coupled signal to generate the first detection signal;
and the second filter is connected to the second coupler and is used for filtering a first signal in the second coupling signal to generate the second detection signal.
8. The radio frequency system of claim 7, wherein the first filter is a band-stop filter.
9. The radio frequency system of claim 7, wherein the second filter is a band pass filter.
10. The radio frequency system according to any of claims 7 to 9, wherein the detection path further comprises: the two first ends of the switch unit are respectively connected with the first filter and the second filter in a one-to-one correspondence manner, a second end of the switch unit is connected with the radio frequency transceiver, and the switch unit is configured to selectively conduct a path between the first coupler, the first filter and the radio frequency transceiver or a path between the second coupler, the second filter and the radio frequency transceiver.
11. The radio frequency system according to any of claims 7 to 9, wherein the first signal is a first independent networking signal in an SA scenario, and the second signal is a second independent networking signal in the SA scenario;
or the first signal is a first frequency band signal in an ENDC scene, and the second signal is a second frequency band signal in the ENDC scene; the frequency band of the first independent networking signal does not include the frequency band of the second frequency band signal, and the frequency band of the second independent networking signal includes the frequency band of the second frequency band signal or a subset of the frequency band of the second frequency band signal.
12. An electronic device characterized in that it comprises a radio frequency system as claimed in any one of claims 1 to 11.
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